At the moment, Costco cannot buy directly from out-of-state vineyards, but must go through Washington's three-tier distribution system, complete with mandatory mark-ups.
On the downside, you do have to give up some of the more premium features like water-cooling or an upper-tier processor, but if you're looking to keep things well under the two grand mark, Computer Shopper says this one is about as good a bet as any.